In gas chromatography (GC), syringes are used to introduce liquid or dissolved samples into the chromatograph for analysis. A GC syringe is typically designed with precision to accurately measure and inject small sample volumes, usually in the microliter range. The sample is then vaporized in the injection port, where it is carried through the GC column by an inert carrier gas for separation. The use of syringes ensures consistent and reproducible sample injection, which is crucial for accurate results in applications like environmental monitoring, chemical analysis, and forensic testing.